Steam hoisting-engine.



PATENTED DEC. 3, 1907. J. W. SMITH. STEAM HOISTING ENGINE.

2 SHEETS-SHEET 1.

APPLICATION FILED JAN. 23, 1905.

11-1: NORRIS PETERS cm, WASHINGTON, D. c.

No. 872,977. PATENTED DEC. 3, 1907.

. J. W. SMITH.

STEAM HOISTING ENGINE.

APPLICATION FILED JAN. 23, I

2 SHEBTS SHEBT 2 1m: NORRIS PETERS cm, wnsmucrmv, n. c.

UNITED STATES PATENT OFFICE.

JOHN W. SMITH, OF LOUISVILLE, KENTUCKY, ASSIGNOR OF ONE-HALF TO JOHN A. COOPER,

OF LOUISVILLE, KENTUCKY.

STEAM HOISTING-ENGINE.

Specification of Letters Patent.

Patented Dec. 3, 1907.

Application filed January 23, 1905. Serial No. 242,258.

T 0 all whom "it may concern:

Be it known that 1, JOHN W. SMITH, a citizen of the United States, and a resident of Louisville, in the county of Jefferson and State of Kentucky, have invented a new and useful Improvement in Steam Hoisting-Engines, for which I seek the protection of Let ters Patent from the United States and of which the following is a specification.

This invention relates to steam engines, more particularly to the class employed for hoisting heavy loads, and also of the class embodying twin steam cylinders having pistons and piston rods connected to one common crank shaft, and adapted to operate in either direction. The engine herein described and shown thus takes the place at reduced expense of two separate engines.

The object of the invention is to produce an engine of this class of improved construction and increased utility and efficiency, and at the same time at reduced expense.

lVith these and other objects in view the invention consists in certain novel features in construction, as hereafter shown and described and specifically pointed out in the claims.

In the drawings employed to illustrate the embodiment of the invention is shown the preferred form of construction, and in the drawings thus employed: Figure 1 is a plan view of the improved engine complete. F 2 is an end elevation of the double cylinder with the steam chest and valve in position therein and one of the cylinder heads removed. Fig. 3 is a longitudinal section on the line 33 of Fig. 2. Fig. 4 is a longitudinal section on the line 44 of Fig. 2. Fig. 5 is a longitudinal section of the steam chest with the valve arranged therein. Fig. 6 is a plan view of the valve detached.

In Fig. 1. is shown a complete engine including the cylinder indicated at 4, the piston rods 2828 operating through stuffing boxes 1111 and supported by a yoke '5, cross heads 1012, spaced guides 13-14, connecting rods 4242, a crank shaft 22, ec centrics 1S19, and eccentric rods 16-17, a reversing link or yoke 9 supported by a bracket 25, a valve rod 7, valve operating devices 27, a supporting yoke 6, and reversing lever devices 8S of approved construction, but as these parts form no portion of the present invention they are not further described.

The cylinder 4 is formed from a solid block,

preferably cylindrical in form, and with two cylinders 3030 bored therein and spaced apart, the cylinder 4 having heads 44 covering both cylinder bores, as shown in Figs. 3 and 4. At one side the cylinder is formed with a flattened seat 4 to receive the steam chest 1, the latter secured in any suitable manner by bolts indicated at 1.

Formed in the seat 4 are four cavities, two of which are shown at 4546 in Fig. 3 and two others at 4748 in Fig. 4, it being un derstood that four of these cavities are formed in the steam chest seat. Leading from the cavities 45-46 are passages 4950, and leading from the cavities 4748 are passages 5152, the passages 49-5O leading obliquely toward and communicating with the cylinder bore 30, and the passages 51-52 leading obliquely toward and communicating with the cylinder bore 30. Leading obliquely from the cylinder 30 is an exhaust passage 31, and leading obliquely from the cylinder 30 is an exhaust passage 31, the two exhaust passages uniting centrally in an exhaust pipe 26, the exhaust passages leading from the cylinders centrally thereof, as shown.

The steam chest 1 is provided with four lugs 37, 37, 38, and 38 fitting into the recesses 45, 46, 47, and 48 respectively, the lugs thus forming stays or supports to prevent lateral movement of the steam chest upon its seat, and relieving the holding bolts 1 largely from lateral strain. The steam chest 1 is provided with a transverse bore 1 in which a cylindrical valve 3 is mounted for oscillation, the valve provided with a stem 3 adapted to be oscillated by the mechanism represented at 27.

The valve 3 is held in position in the steam chest by heads 5354. Leading obliquely from the upper portion of the valve bore 1 are passages 5556, the lower ends of these passages extending through the lugs 3737 and communicating respectively with the passages 4950 of the cylinder 30. Leading obliquely from the lower side of the valve bore 1 are passages 5758, the lower ends of these latter passages extending through the lugs 3S-3S and communicating respectively with the passages 5152 of the cylinthe other end with the steam inlet pipe 60. The valve 3 is provided with steam passages indicated at 61 and lands or cut-off faces 62, these passages and lands being so arranged that when the valve is disposed in one position through the operation of the eccentrics and valve operating devices the steam will be admitted at one end of the cylinder 30 and at the opposite end of the cylinder 30", and then when the valve is reversedin position the steam will be admitted to the opposite end of the cylinder 30 and also to the opposite end of the cylinder 30", and thus drive the crank shaft continuously, the exhaust taking place through the exhaust passages 3131, as will be obvious. By this arrangement the steam is admitted to and exhausted from the cylinders in regular order by the action of the valve, and by reversing the position of the valve the motion will likewise be reversed.

The cylinder 4, as before stated, is formed from a solid block of metal preferably cast iron, while the steam chest 1 is likewise formedfrom a solid block, with the several steam passages or ports bored therein, thus producing. a cheaply constructed device, and

requiring no expensive patterns and molding operations with their accompanying expensive and troublesome cores, and like devices. The whole engine can thus be constructed from blocks and irregular shaped pieces of otherwise discarded material. The device is extremely simple, containing few parts, can be inexpensively manufactured, and employed wherever engines of this character are required. The engine can be constructed of any required size, and of any required horse power, and of any suitable material or combinations of material.

The solid reciprocating valve is more durable than either a hollow or a rotary valve; the port for the steam running in a straight, but slanting line are much easier and cheaper to manufacture, and much easier to clean than the broken line ducts which have been heretofore used in double cylinder engines.

What I claim as my own invention and desire to protect by Letters-Patent is:

1. In a steam engine, a body having two cylinder bores spaced apart therein and provided respectively with exhaust passages leading therefrom centrally of the cylinder at one side and with a flattened face at another side with steam passages communicating between said flattened face and the opposite ends of said cylinder bores, heads connected to said body and extending over said cylinder bores, pistons movable in said cylinders and provided respectively with piston rods extending through one of said heads, a crank shaft, connecting means between said crank shaft and piston rods, a steam chest bearing upon the flattened surface of said body and provided with a valve bore, steam passages communicating respectively between said valve bore and the steam passages of said body, an intake passage in said steam chest and having a steam supply pipe communicating therewith and leading into said valve bore, a valve mounted for oscillation=in said bore and provided with alternating steam passages and cut-ofi lands, and connect ing means between said crank shaft and valve for operating the same.

2. In a steam engine, a body having two cylinder bores spaced apart therein and provided respectively with exhaust passages leading therefrom centrally of the cylinders at one side and with a flattened face atanother side, said flattened face having spaced cavities therein and with steam passages communicating between said cavities and the opposite ends of said cylinder bores, pistons movable in said cylinders and provided respectively with piston rods extending through one of said heads, a crank shaft, connecting means between said crank shaft and piston rods, a steam chest bearing upon the flattened surface of said body and provided with lugs bearing in said recesses and provided with a valve bore, steam passages communicating at one end with said valve bore and leading at the other ends through said lugs and likewise communicating with the steam passages of said body, an intake passage in said steam chest and having a steam supply pipe communicating therewith and leading into said valve bore, a valve mounted for oscillation in said bore and provided with alternating steam passages and cut-ofl lands, and connecting means between said crank shaft and valve for operating the same.

Witness my hand in the presence of the two attesting witnesses whose names are hereunto subscribed.

JOHN W. SMITH.

Witnesses: A. LINCOLN DEMLITZ, I JAs. W. GARRIsoN. 

